package org.csource.quickstart.util;


import java.lang.reflect.Field;

import org.springframework.aop.framework.AdvisedSupport;
import org.springframework.aop.framework.AopProxy;
import org.springframework.aop.support.AopUtils;

public class AopTargetUtils {

  
  /** 
   * 获取 目标对象 
   * @param proxy 代理对象 
   * @return  
   * @throws Exception 
   */  
  public static Object getTarget(Object proxy) throws Exception {  
      if(!AopUtils.isAopProxy(proxy)) {  
          return proxy;//不是代理对象  
      }  
      if(AopUtils.isJdkDynamicProxy(proxy)) {  
          return getJdkDynamicProxyTargetObject(proxy);  
      } else { 
          return getCglibProxyTargetObject(proxy);  
      }  
        
  }  


  private static Object getCglibProxyTargetObject(Object proxy) throws Exception {  
      Field h = proxy.getClass().getDeclaredField("CGLIB$CALLBACK_0");
      h.setAccessible(true);  
      Object dynamicAdvisedInterceptor = h.get(proxy);  
        
      Field advised = dynamicAdvisedInterceptor.getClass().getDeclaredField("advised");  
      advised.setAccessible(true);  
        
      Object target = ((AdvisedSupport)advised.get(dynamicAdvisedInterceptor)).getTargetSource().getTarget();  
        
      return target;  
  }  


  private static Object getJdkDynamicProxyTargetObject(Object proxy) throws Exception {  
      Field h = proxy.getClass().getSuperclass().getDeclaredField("h");  
      h.setAccessible(true);  
      AopProxy aopProxy = (AopProxy) h.get(proxy);  
      Field advised = aopProxy.getClass().getDeclaredField("advised");  
      advised.setAccessible(true);  
      Object target = ((AdvisedSupport)advised.get(aopProxy)).getTargetSource().getTarget();  
      return target;  
  }  
  
}
